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Topics: Chemical reaction, Chemistry, Sodium Pages: 3 (688 words) Published: June 17, 2014
Gerona, Evelyn
Chemical Reactions
Experiment No. 7
Date Performed: Feb. 17, 2014
Date Submitted: Feb. 24, 2014
Mrs. Vitancol
I. Theoretical Framework
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes may both occur. The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. Chemical reactions are usually characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants. Reactions often consist of a sequence of individual sub-steps, the so-called elementary reactions, and the information on the precise course of action is part of the reaction mechanism. Chemical reactions are described with chemical equations, which graphically present the starting materials, end products, and sometimes intermediate products and reaction conditions. Four Types of Chemical Reaction and example :

Combination or Synthesis Reactions   Two or more reactants unite to form a single product.                                      S   +   O2 --------->  SO2                                 sulphur    oxygen            sulphur dioxide                                   2 S      +    3 O2 --------->  2 SO3                                  sulphur            oxygen                 sulphur trioxide                                 2 Fe   +   O2  --------->  2 FeO                                  iron        oxygen                    iron (II)  oxide    

 

Decomposition Reactions  ...
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